Commit fc72ae40 authored by Josh Poimboeuf's avatar Josh Poimboeuf Committed by Ingo Molnar
Browse files

x86/unwind: Make CONFIG_UNWINDER_ORC=y the default in kconfig for 64-bit 



The ORC unwinder has been stable in testing so far.  Give it much wider
testing by making it the default in kconfig for x86_64.  It's not yet
supported for 32-bit, so leave frame pointers as the default there.

Suggested-by: default avatarIngo Molnar <mingo@kernel.org>
Signed-off-by: default avatarJosh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/9b1237bbe7244ed9cdf8db2dcb1253e37e1c341e.1507924831.git.jpoimboe@redhat.com


Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent 11af8474

arch/x86/Kconfig.debug

+17 −16
Original line number Diff line number Diff line
@@ -358,27 +358,13 @@ config PUNIT_ATOM_DEBUG 


choice

	prompt "Choose kernel unwinder"

	default UNWINDER_FRAME_POINTER

	default UNWINDER_ORC if X86_64

	default UNWINDER_FRAME_POINTER if X86_32

	---help---

	  This determines which method will be used for unwinding kernel stack

	  traces for panics, oopses, bugs, warnings, perf, /proc/<pid>/stack,

	  livepatch, lockdep, and more.



config UNWINDER_FRAME_POINTER

	bool "Frame pointer unwinder"

	select FRAME_POINTER

	---help---

	  This option enables the frame pointer unwinder for unwinding kernel

	  stack traces.



	  The unwinder itself is fast and it uses less RAM than the ORC

	  unwinder, but the kernel text size will grow by ~3% and the kernel's

	  overall performance will degrade by roughly 5-10%.



	  This option is recommended if you want to use the livepatch

	  consistency model, as this is currently the only way to get a

	  reliable stack trace (CONFIG_HAVE_RELIABLE_STACKTRACE).



config UNWINDER_ORC

	bool "ORC unwinder"

	depends on X86_64
@@ -395,6 +381,21 @@ config UNWINDER_ORC 
	  Enabling this option will increase the kernel's runtime memory usage

	  by roughly 2-4MB, depending on your kernel config.



config UNWINDER_FRAME_POINTER

	bool "Frame pointer unwinder"

	select FRAME_POINTER

	---help---

	  This option enables the frame pointer unwinder for unwinding kernel

	  stack traces.



	  The unwinder itself is fast and it uses less RAM than the ORC

	  unwinder, but the kernel text size will grow by ~3% and the kernel's

	  overall performance will degrade by roughly 5-10%.



	  This option is recommended if you want to use the livepatch

	  consistency model, as this is currently the only way to get a

	  reliable stack trace (CONFIG_HAVE_RELIABLE_STACKTRACE).



config UNWINDER_GUESS

	bool "Guess unwinder"

	depends on EXPERT

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